ar 4 W O X611 i 1n m La Wi x 1m p Y Y Tt fY r 2 Inspect the valves for burned faces excessive seat pound in cracked faces or badly scuffed or worn valve stems 3 Inspect valve seats for cracks or burnt seats Inspect valve guides for cracks or excessive wear NOTE If valve seats are beyond repair cylinder head replacement is necessary Excessive valve to bore clearance may cause oil consumption Insufficient clearance will result in noisy and sticky functioning of the valve and disturb engine smoothness of operation 4 Measure valve stem clearance fig 82 as follows Clamp a dial indicator on one side of the cylinder head rocker cover gasket rail locating the indicator so that movement of the valve stem from side to side crosswise to the head will cause a direct movement of the indicator stem The indicator stem must contact the side of the valve stem just above the valve guide With the valve head dropped about 1 16 off the valve seat move the stem of the valve from side to side using light pressure to obtain a clearance reading If clearance exceeds specifications it will be necessary to ream valve guides for oversize valve or replace valve guides as outlined under Repair Y t j t Y L Af Fig 82 Measuring Valve Stem Clearance ceevar sMt ur aW